kernel/net/ipv6/sysctl_net_ipv6.c

   1 /*
   2  * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
   3  *
   4  * Changes:
   5  * YOSHIFUJI Hideaki @USAGI:    added icmp sysctl table.
   6  */
   7
   8 #include <linux/mm.h>
   9 #include <linux/sysctl.h>
  10 #include <linux/in6.h>
  11 #include <linux/ipv6.h>
  12 #include <linux/slab.h>
  13 #include <linux/export.h>
  14 #include <net/ndisc.h>
  15 #include <net/ipv6.h>
  16 #include <net/addrconf.h>
  17 #include <net/inet_frag.h>
  18
  19 static int one = 1;
  20
  21 static struct ctl_table ipv6_table_template[] = {
  22         {
  23                 .procname       = "bindv6only",
  24                 .data           = &init_net.ipv6.sysctl.bindv6only,
  25                 .maxlen         = sizeof(int),
  26                 .mode           = 0644,
  27                 .proc_handler   = proc_dointvec
  28         },
  29         {
  30                 .procname       = "anycast_src_echo_reply",
  31                 .data           = &init_net.ipv6.sysctl.anycast_src_echo_reply,
  32                 .maxlen         = sizeof(int),
  33                 .mode           = 0644,
  34                 .proc_handler   = proc_dointvec
  35         },
  36         {
  37                 .procname       = "flowlabel_consistency",
  38                 .data           = &init_net.ipv6.sysctl.flowlabel_consistency,
  39                 .maxlen         = sizeof(int),
  40                 .mode           = 0644,
  41                 .proc_handler   = proc_dointvec
  42         },
  43         {
  44                 .procname       = "auto_flowlabels",
  45                 .data           = &init_net.ipv6.sysctl.auto_flowlabels,
  46                 .maxlen         = sizeof(int),
  47                 .mode           = 0644,
  48                 .proc_handler   = proc_dointvec
  49         },
  50         {
  51                 .procname       = "fwmark_reflect",
  52                 .data           = &init_net.ipv6.sysctl.fwmark_reflect,
  53                 .maxlen         = sizeof(int),
  54                 .mode           = 0644,
  55                 .proc_handler   = proc_dointvec
  56         },
  57         {
  58                 .procname       = "idgen_retries",
  59                 .data           = &init_net.ipv6.sysctl.idgen_retries,
  60                 .maxlen         = sizeof(int),
  61                 .mode           = 0644,
  62                 .proc_handler   = proc_dointvec,
  63         },
  64         {
  65                 .procname       = "idgen_delay",
  66                 .data           = &init_net.ipv6.sysctl.idgen_delay,
  67                 .maxlen         = sizeof(int),
  68                 .mode           = 0644,
  69                 .proc_handler   = proc_dointvec_jiffies,
  70         },
  71         { }
  72 };
  73
  74 static struct ctl_table ipv6_rotable[] = {
  75         {
  76                 .procname       = "mld_max_msf",
  77                 .data           = &sysctl_mld_max_msf,
  78                 .maxlen         = sizeof(int),
  79                 .mode           = 0644,
  80                 .proc_handler   = proc_dointvec
  81         },
  82         {
  83                 .procname       = "mld_qrv",
  84                 .data           = &sysctl_mld_qrv,
  85                 .maxlen         = sizeof(int),
  86                 .mode           = 0644,
  87                 .proc_handler   = proc_dointvec_minmax,
  88                 .extra1         = &one
  89         },
  90         { }
  91 };
  92
  93 static int __net_init ipv6_sysctl_net_init(struct net *net)
  94 {
  95         struct ctl_table *ipv6_table;
  96         struct ctl_table *ipv6_route_table;
  97         struct ctl_table *ipv6_icmp_table;
  98         int err;
  99
 100         err = -ENOMEM;
 101         ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 102                              GFP_KERNEL);
 103         if (!ipv6_table)
 104                 goto out;
 105         ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
 106         ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
 107         ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
 108         ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
 109         ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
 110         ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
 111         ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
 112
 113         ipv6_route_table = ipv6_route_sysctl_init(net);
 114         if (!ipv6_route_table)
 115                 goto out_ipv6_table;
 116
 117         ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 118         if (!ipv6_icmp_table)
 119                 goto out_ipv6_route_table;
 120
 121         net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 122         if (!net->ipv6.sysctl.hdr)
 123                 goto out_ipv6_icmp_table;
 124
 125         net->ipv6.sysctl.route_hdr =
 126                 register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 127         if (!net->ipv6.sysctl.route_hdr)
 128                 goto out_unregister_ipv6_table;
 129
 130         net->ipv6.sysctl.icmp_hdr =
 131                 register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 132         if (!net->ipv6.sysctl.icmp_hdr)
 133                 goto out_unregister_route_table;
 134
 135         err = 0;
 136 out:
 137         return err;
 138 out_unregister_route_table:
 139         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 140 out_unregister_ipv6_table:
 141         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 142 out_ipv6_icmp_table:
 143         kfree(ipv6_icmp_table);
 144 out_ipv6_route_table:
 145         kfree(ipv6_route_table);
 146 out_ipv6_table:
 147         kfree(ipv6_table);
 148         goto out;
 149 }
 150
 151 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 152 {
 153         struct ctl_table *ipv6_table;
 154         struct ctl_table *ipv6_route_table;
 155         struct ctl_table *ipv6_icmp_table;
 156
 157         ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 158         ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 159         ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
 160
 161         unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 162         unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 163         unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 164
 165         kfree(ipv6_table);
 166         kfree(ipv6_route_table);
 167         kfree(ipv6_icmp_table);
 168 }
 169
 170 static struct pernet_operations ipv6_sysctl_net_ops = {
 171         .init = ipv6_sysctl_net_init,
 172         .exit = ipv6_sysctl_net_exit,
 173 };
 174
 175 static struct ctl_table_header *ip6_header;
 176
 177 int ipv6_sysctl_register(void)
 178 {
 179         int err = -ENOMEM;
 180
 181         ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 182         if (!ip6_header)
 183                 goto out;
 184
 185         err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 186         if (err)
 187                 goto err_pernet;
 188 out:
 189         return err;
 190
 191 err_pernet:
 192         unregister_net_sysctl_table(ip6_header);
 193         goto out;
 194 }
 195
 196 void ipv6_sysctl_unregister(void)
 197 {
 198         unregister_net_sysctl_table(ip6_header);
 199         unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 200 }